How to uninstall the programs clearly on Windows NT?

For instance, consider the migration from 16-bit to 32-bit x86 processor architectures. Microsoft brought out its first 32-bit version of Windows, Windows NT 3.1, in 1993, yet it wasn't until 2001, with the release of Windows XP, that it was able to put out a mass-market 32-bit OS that did away with most of the backward compatibility with 16-bit code. Now there is the next transition, to 64-bit processor architectures. Windows XP Professional x64 Edition was released in 2005, but full 64-bit support in the way of applications and hardware drivers still remains thin on the ground, and the migration looks likely to be at least as protracted as the 16-to-32-bit one.